Flight profile · United Airlines
UA2124
Houston (IAH) to Chicago (ORD) · scheduled 9:30 AM – 12:26 PM
How UA2124 performs
605 operations, December 2024 – August 2026.
Between its first and last recorded date on IAH → ORD, UA2124 averaged about one operation a day or more (605 in 621 days, cancelled ones included).
UA2124 arrived on time 86.5% of the time, against 76.8% for all IAH → ORD flights, so this departure is 9.7 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 6.6 points better.
Source: US DOT Bureau of Transportation Statistics · 605 operations, December 2024 – August 2026 · If UA2124 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where UA2124 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| UA2124 | 86.5% | 0.33% | -12 min | 4.3% | 605 |
| United Airlines on IAH → ORD | 79.9% | 0.90% | -6 min | 7.5% | 12,143 |
| All IAH → ORD flights | 76.8% | 1.41% | -6 min | 9.4% | 17,571 |
UA2124 cancelled 2 of 605 operations (0.33%), below the 1.41% for IAH → ORD; on a count this small the difference is not a finding.
4.3% of UA2124’s arrivals were an hour or more late, against 9.4% across IAH → ORD, so the long delays are less common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · December 2024 – August 2026
Why UA2124 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA2124 on IAH → ORD. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering December 2024 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies UA2124 comes in late, and what that does to the departure.
The aircraft flying UA2124 came in 15 or more minutes late on 14% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Matched by tail number to the aircraft’s previous flight into IAH: 463 of 603 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| UA2124 | 14% |
| Network, same turn | 17% |
78 scheduled minutes is enough to clean and board when the aircraft is on time, with little to spare when it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often UA2124’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
Source: US DOT Bureau of Transportation Statistics · Data covering December 2024 – August 2026
From pushback to gate
When it leaves IAH late, does that still matter by the time it reaches ORD?
UA2124 pushes back an average of 6.2 minutes late and reaches the gate at ORD an average of 3.0 minutes early. The 9.2 minutes between those two figures are slack the published schedule already carries, so on average a late pushback on this flight is made up before the gate. Its 20.9 minutes on the taxiways at IAH is about what any departure from the airport in that hour spends.
On arrival at ORD, UA2124 spends 14.0 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 4.0 minutes shorter than a typical ORD arrival (18.0 min).
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 27,744 IAH departures. Taxi-in is landing to gate, set against 985,848 arrivals at ORD. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · December 2024 – August 2026
The hour it leaves IAH
UA2124 has one departure time, 9:30 AM, so this is what that hour at IAH is worth.
On-time arrival rate. 27,744 departures from IAH are scheduled in the 9 AM–10 AM hour over the period, against 369,255 across the whole day.
UA2124 is scheduled out of IAH at 9:30 AM, in the 9 AM–10 AM bank. Departures from IAH in that hour arrive on time 82.9% of the time against 77.5% across the airport’s whole day — the slot alone is worth 5.4 points better before anything about this particular flight is considered.
Both airport figures cover every destination from IAH, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · December 2024 – August 2026 · Hours below 120 departures are not scored.
Other routes UA2124 has flown
Carriers reassign flight numbers. UA2124 also served these 24 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| MSY→IAH New Orleans to Houston | March 5, 2026 – August 31, 2026 | 180 | 72.6% |
| ORD→BWI Chicago to Baltimore | June 25, 2026 – August 10, 2026 | 47 | — |
| ORD→LGA Chicago to New York | June 1–24, 2026 | 24 | — |
| PNS→IAH Pensacola to Houston | March 30, 2025 – February 11, 2026 | 124 | 89.3% |
| MEM→IAH Memphis to Houston | December 18, 2025 – January 5, 2026 | 19 | — |
| ORD→LAX Chicago to Los Angeles | December 21, 2023 – December 17, 2025 | 102 | 78.0% |
| LAX→SMF Los Angeles to Sacramento | October 26, 2025 – November 30, 2025 | 15 | — |
| ORD→EWR Chicago to Newark | September 2–24, 2025 | 23 | — |
| ORD→JAC Chicago to Jackson | August 19, 2025 – September 1, 2025 | 14 | — |
| MFE→IAH McAllen to Houston | February 13, 2025 – March 5, 2025 | 21 | — |
| BUR→SFO Burbank to San Francisco | October 27, 2024 – December 18, 2024 | 50 | — |
| SFO→BOS San Francisco to Boston | October 27, 2024 – December 2, 2024 | 36 | — |
| CMH→ORD Columbus to Chicago | September 26, 2024 – October 26, 2024 | 31 | — |
| LAX→CLE Los Angeles to Cleveland | June 27, 2024 – September 23, 2024 | 73 | — |
| ORD→PHX Chicago to Phoenix | March 31, 2024 – June 26, 2024 | 88 | — |
| SNA→IAH Santa Ana to Houston | March 7–30, 2024 | 24 | — |
| MIA→DEN Miami to Denver | February 15, 2024 – March 6, 2024 | 21 | — |
| JAX→EWR Jacksonville to Newark | January 9, 2024 – February 14, 2024 | 37 | — |
| EWR→LAS Newark to Las Vegas | October 29, 2023 – December 20, 2023 | 51 | — |
| IAH→MFE Houston to McAllen | October 30, 2023 | 1 | — |
| IAD→CLE Washington to Cleveland | September 29, 2023 – October 28, 2023 | 30 | — |
| IAH→DEN Houston to Denver | September 5–28, 2023 | 24 | — |
| CLE→DEN Cleveland to Denver | August 1, 2023 – September 4, 2023 | 35 | — |
| EWR→CLE Newark to Cleveland | July 1–31, 2023 | 31 | — |
The figures above describe only IAH → ORD, the route UA2124 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
23 min late
against a median of 12 min early
Percentiles over 605 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering December 2024 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA2124 this flight | United Airlines | 86.5% | 12 min early | 605 |
| UA787 | United Airlines | 71.1% | 2 min early | 1,156 |
Among all 2 departures on this route with at least 600 operations, UA2124 has the highest on-time rate. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 605 records of UA2124 operating IAH → ORD, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule; cancelled and diverted flights are reported separately, not in the on-time rate.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed